wp-extend-wp_post-object.php

<?php

add_filter('posts_results', 'hwk_post_object_extend', 10, 2);
function hwk_post_object_extend($posts, $query){
    if(empty($posts))
        return $posts;
    
    foreach($posts as $post){
        // Post Type = post
        if(get_post_type($post) != 'post')
            continue;
        
        // Add terms to WP_POST
        $post->my_terms = false;
        if($terms = get_the_terms($post->ID, 'my_taxonomy'))
            $post->my_terms = $terms;
        
        // 'Single' view only
        if($query->is_single()){
            
            // Add post meta data
            $post->my_meta = false;
            if($meta = get_post_meta($post->ID, 'my_meta_key', true))
                $post->my_meta = $meta;
            
        }
    }

    return $posts;
}